<html>
<body>


<form method="post" enctype="multipart/form-data" action="/upload?uid=123" >
    <div>
        <label for="file">Choose file to upload</label>
        <input type="file" id="file" name="file" multiple="multiple"/>
    </div>
    <div>
        <button>Submit</button>
    </div>
</form>


</body>
</html>